Error: import Point3D of Geometry Module of sympy0.7.5 in Blender2.71
I found the solution: 


get a fresh copy of sympy by git;
simply copy the subdirectory "sympy" into the corresponding site-packages directory of my blender:
  c:\Program Files\Blender Foundation\Blender\2.71\python\lib\site-packages\

Every is fine now. 


ouyang